/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.nifi.nar;

public final class NarClassLoadersHolder {

    private static volatile NarClassLoaders INSTANCE;

    /**
     * @return The singleton instance of the NarClassLoaders
     */
    public static NarClassLoaders getInstance() {
        if (INSTANCE == null) {
            synchronized (NarClassLoadersHolder.class) {
                if (INSTANCE == null) {
                    INSTANCE = new NarClassLoaders();
                }
            }
        }
        return INSTANCE;
    }

    private NarClassLoadersHolder() {

    }

}
